#4270B2
Closest named color: French Blue (#436BAD). oklch(54.4% 0.116 257.5), rgb(66, 112, 178).
Aa
White text reads best on this color (5.00:1).
About this color
#4270B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.116 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.015 away. White text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.19:1 |
| White text | 5.00:1 |
Values
| HEX | #4270B2 |
| RGB | rgb(66, 112, 178) |
| HSL | hsl(215, 46%, 48%) |
| OKLCH | oklch(54.4% 0.116 257.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #4270B2 | 5.00:1 | AA | Lc -79.8 | Fine for body text |
| Black text on #4270B2 | 4.19:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #4270B2 text on white | 5.00:1 | AA | Lc 74.4 | Content text, not long reading |
| #4270B2 text on black | 4.19:1 | AA large text | Lc -27.3 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#80A2D5
oklch(70.6% 0.084 258.3)
-
Step 500
500
#5F8BC9
oklch(63.1% 0.106 257.1)
-
Step 600
600 (this color)
#4270B2
oklch(54.4% 0.116 257.5)
-
Step 700
700
#37619D
oklch(49.2% 0.108 257.5)
-
Step 800
800
#2E4F7F
oklch(42.7% 0.089 257.8)
-
Step 900
900
#294266
oklch(37.7% 0.069 257.5)
-
Step 950
950
#18273C
oklch(27% 0.044 256.9)
#4270B2 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5475B5 | 0.026 |
| Deuteranopia (no green cones) | #446AB1 | 0.016 |
| Tritanopia (no blue cones) | #007F88 | 0.097 |
| Achromatopsia (no color) | #6F6F6F | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4270B2
#4270B2
oklch(54.4% 0.116 257.5)
- #946600
#946600
oklch(54.5% 0.114 77.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #4270B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.021
- Windows Blue #3778BF ΔE 0.027
- Mid Blue #276AB3 ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Nice Blue #107AB0 ΔE 0.039
- Dull Blue #49759C ΔE 0.042
- Cerulean #457B9D ΔE 0.052
Use #4270B2 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.